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Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Leases
Operating lease right-of-use assets	$ 35.4	$ 40.1
Current portion of operating lease liabilities	12.4	11.3
Operating lease liabilities, net of current portion	23.1	28.9
Total operating lease liabilities	35.5	40.2
Finance leases
Property, plant and equipment at cost	485.4	464.5
Accumulated depreciation	(271.0)	(253.7)
Property, plant and equipment, Net	214.4	210.8
Current portion of finance leases	0.1	0.5
Finance leases, net of current portion	0.0	0.1
Total finance lease liabilities	$ 0.1	$ 0.6
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of finance leases	Current portion of finance leases
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Finance leases, net of current portion	Finance leases, net of current portion
Weighted average remaining lease term
Operating leases	4 years 10 months 24 days	4 years 1 month 6 days
Finance leases	6 months	1 year 1 month 6 days
Weighted average discount rate
Operating leases	2.50%	3.00%
Finance leases	2.50%	2.60%
Financial Leases [Member]
Finance leases
Property, plant and equipment at cost	$ 5.0	$ 9.0
Accumulated depreciation	(4.5)	(8.0)
Property, plant and equipment, Net	0.5	1.0
Current portion of finance leases	0.1	0.5
Finance leases, net of current portion	0.0	0.1
Total finance lease liabilities	$ 0.1	$ 0.6

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